Yet another Fe126e mod! - Page 3

knorke · 16th January 2007, 06:23 PM

Quote:

Originally posted by dfreemansc
Knorke
Yes a gated response would be much better, but when I tried using Speaker Workshop I got totally non-reproducible results - probably GIGO on my part, but I got fed up of it!

I can recommend ARTA for taking measurements.
The demo version is nearly full functional. And 75€
is not to much for the full version. A good and reliable
measurement setup will help you to get the most out of your speakers...

dfreemansc · 16th January 2007, 09:19 PM

Thanks - I'll check it out.

Svein_B · 22nd January 2007, 08:17 PM

I have been inspired by this tread to try the ARTA speaker measurement software. I already had some Panasonic electret capsules purchased in the hope of being able to make a simple measurement system. I am very impressed by this software and what it does!

I have two pairs of FE126E. One pair has been treated with a little to much coating resulting in some loss of "sting", the other pair is brand new (only a few hours), and only [just] listeneble with my sweetest sounding SE amp.

Below is measurements of an experiment to try to dampen the cone brakup modes on a new driver. I temporarily arranged five 2/3" felt furniture pads arround the outer part of the cone. Not a complete success, but a hint of less sharp resonances - but as always some loss of highs.

Svein_B · 22nd January 2007, 09:29 PM

OPS!
Just realized that the above measurements were done with the wrong microphone - not the Panasonic. That explains some of the peaks, but the differences should be representative.

Here is another measurement with the right mic, on-axis 1m.
This looks almost too good

Svein_B · 24th January 2007, 08:55 PM

Here is an experiment with a narrow notch-filter to tame the peak just below 7 KHz.

I am not (yet) sure if the filter will improve the sound, but it may seem to move some sharper sounds a bit backwards. I think however that the problem of the 7KHz peak (if it is a problem) depends to a great extent on the listening room and in particular the distance from listener to the speakers.

To illustrate the consistency of different measurements of the 126e, I have assembled all the measurements referred to earlier in this thread stretched to the same scale here: FE-126e Measurements (100KB)
They all show good consistency above 2 KHz.

SveinB.

holdent · 26th January 2007, 12:19 PM

Svein_B - Great measurements and comparisons! I've started to do the same but looking at BSCs in a FE126E project. What type of enclosure were you using when you did these measurements?

Also I'm not familiar with ARTA (I use TrueRTA), were these measurements done using white noise or pink noise?

Thanks!

planet10 · 26th January 2007, 06:11 PM

Acknowledgement are due to Mark M on the crumbs he left that lead to my FE126/127 mod. It would not have been as successful as it is if i wsas not able to stand on his shoulders. I simply took the tools i had available, Mark's comments, and my experience modding drivers & rolled them into something -- if not perfect -- certainly makes an FE126 or FE127 sound WAY better.

Chris & i are just assembling some tools to do both quantitiative & qualitative assessment of a number of mods.

dave

Svein_B · 26th January 2007, 06:43 PM

Thanks for joining in Dave! I look forward to seeing comparative measurements of your modded drivers. Since there are many testimonials about the sonic results, the measurements may help to understand what makes the difference.

The notch-filter experiment shown above is not something I am sure I will recommend. The very sharp filter requires precise component tuning. 10% tolerances would miss the point.

The felt-pad experiment in post#23 indicate that a mechanical modification may produce a better smoothing of the peaks - when ignoring the large hump around 5K caused by using the wrong microphone.

SveinB

planet10 · 27th January 2007, 02:27 AM

Quote:

Originally posted by Svein_B
the measurements may help to understand what makes the difference.

There are some things a FR will not show (a waterfall might thou) and that is the pushing down of the noise floor (as well as using the FE127e as a guinea pig we are using CSS FR125S. There is 1 mod that makes a dramatic improvement. The tonal character remains unchanged, but the downward dynamic range increases markedly)

dave

germpod · 27th January 2007, 05:06 AM

((((Acknowledgement are due to Mark M on the crumbs he left that lead to my FE126/127 mod. It would not have been as successful as it is if i wsas not able to stand on his shoulders. I simply took the tools i had available, Mark's comments, and my experience modding drivers & rolled them into something -- if not perfect -- certainly makes an FE126 or FE127 sound WAY better.)))))

I like the Einstein reference of standing on shoulders of people before you. It is one of my favorite quotes, helps me keep perspective off all the work and brilliant minds that helped us all get to where we are.

26th January 2007, 06:11 PM	#27
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	Acknowledgement are due to Mark M on the crumbs he left that lead to my FE126/127 mod. It would not have been as successful as it is if i wsas not able to stand on his shoulders. I simply took the tools i had available, Mark's comments, and my experience modding drivers & rolled them into something -- if not perfect -- certainly makes an FE126 or FE127 sound WAY better. Chris & i are just assembling some tools to do both quantitiative & qualitative assessment of a number of mods. dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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16th January 2007, 09:19 PM	#22
dfreemansc diyAudio Member Join Date: Jul 2004 Location: West Midlands, England	Thanks - I'll check it out.

26th January 2007, 12:19 PM	#26
holdent diyAudio Member Join Date: Nov 2005 Location: Ontario	Svein_B - Great measurements and comparisons! I've started to do the same but looking at BSCs in a FE126E project. What type of enclosure were you using when you did these measurements? Also I'm not familiar with ARTA (I use TrueRTA), were these measurements done using white noise or pink noise? Thanks!

26th January 2007, 06:43 PM	#28
Svein_B diyAudio Member Join Date: Oct 2005	Thanks for joining in Dave! I look forward to seeing comparative measurements of your modded drivers. Since there are many testimonials about the sonic results, the measurements may help to understand what makes the difference. The notch-filter experiment shown above is not something I am sure I will recommend. The very sharp filter requires precise component tuning. 10% tolerances would miss the point. The felt-pad experiment in post#23 indicate that a mechanical modification may produce a better smoothing of the peaks - when ignoring the large hump around 5K caused by using the wrong microphone. SveinB

27th January 2007, 05:06 AM	#30
germpod diyAudio Member Join Date: Dec 2006	((((Acknowledgement are due to Mark M on the crumbs he left that lead to my FE126/127 mod. It would not have been as successful as it is if i wsas not able to stand on his shoulders. I simply took the tools i had available, Mark's comments, and my experience modding drivers & rolled them into something -- if not perfect -- certainly makes an FE126 or FE127 sound WAY better.))))) I like the Einstein reference of standing on shoulders of people before you. It is one of my favorite quotes, helps me keep perspective off all the work and brilliant minds that helped us all get to where we are.